PM2.5 in Ratchathewi, Bangkok now
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PM2.5 statistics for Ratchathewi, Jun 2025 to Jun 2026
Over 366 days with data the average was 23.7 µg/m³ (Good), and 32 of those days went over the daily limit of 37.5.
The nearest station to Ratchathewi has no imported history, so these figures come from National Housing Authority Dindaeng, about 1 km away.
Monthly average
Days in each air quality band
About PM2.5 data for Ratchathewi
PM2.5 for Ratchathewi, Bangkok comes from Ratchathewi District Office, Bangkok, the nearest station in the Air4Thai network. Daily history is available for 2016-2026.
PM2.5 levels
| Level | PM2.5 (µg/m³) |
|---|---|
| Excellent | 0-15 |
| Good | 15.1-25 |
| Moderate | 25.1-37.5 |
| Unhealthy for sensitive groups | 37.6-75 |
| Unhealthy | 75+ |
Frequently asked questions
Which station measures PM2.5 for Ratchathewi, Bangkok?
Ratchathewi uses the nearest Air4Thai monitoring station, Ratchathewi District Office, Bangkok, about 1 km from the district centre. The page shows this distance next to every reading.
At what PM2.5 level should I wear a mask?
Above 25 µg/m³ (the moderate level, 25.1 to 37.5) at-risk groups should wear a surgical mask outdoors for long periods. From 37.6 to 75 the air starts to affect health and an N95 mask is advised outdoors. Above 75 avoid outdoor activity and wear an N95 mask whenever you go out.
How often is the data updated?
Readings come from the Pollution Control Department's Air4Thai feed and are refreshed every hour. If a station has not reported for over 3 hours the page marks the reading as old.
Can I see past PM2.5 for Ratchathewi?
Yes. Open the daily history on the page for a chart of PM2.5 from the nearest station. Stored history covers 2016-2026.
What is AQI and how is it different from PM2.5?
AQI (Air Quality Index) is a single number calculated from several pollutants: PM2.5, PM10, ozone, carbon monoxide, nitrogen dioxide and sulphur dioxide. The pollutant with the worst value in that hour sets the AQI. The Pollution Control Department's bands are 0 to 25 excellent, 26 to 50 good, 51 to 100 moderate, 101 to 200 unhealthy for sensitive groups and 201 and above unhealthy. PM2.5 is one pollutant only: the concentration of particles up to 2.5 microns across, measured in µg/m³. This site uses PM2.5 as its main value and for card colours, and shows AQI as supporting data, so the two can fall in different bands.